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Summary of Significant Accounting Policies (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2020
USD ($)
subsidiaryTrust
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]                
Reserve requirements for banking subsidiaries   $ 0 $ 0 $ 0 $ 9,500      
Equity   717,689 717,689 717,689 663,054 $ 620,871   $ 576,202
Investment in qualified affordable housing projects   180 $ 180 $ 180 485      
Number of reportable business segments     3 3        
Retained earnings   $ 418,413 $ 418,413 $ 418,413 370,477      
Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Equity         1,707      
Minimum | Core deposit intangible                
Property, Plant and Equipment [Line Items]                
Amortization period for other intangible assets (in years)   5 years            
Minimum | Covenants not to compete                
Property, Plant and Equipment [Line Items]                
Amortization period for other intangible assets (in years)   3 years            
Minimum | Customer relationships                
Property, Plant and Equipment [Line Items]                
Amortization period for other intangible assets (in years)   6 years            
Maximum | Core deposit intangible                
Property, Plant and Equipment [Line Items]                
Amortization period for other intangible assets (in years)   10 years            
Maximum | Covenants not to compete                
Property, Plant and Equipment [Line Items]                
Amortization period for other intangible assets (in years)   6 years            
Maximum | Customer relationships                
Property, Plant and Equipment [Line Items]                
Amortization period for other intangible assets (in years)   15 years            
Building | Minimum                
Property, Plant and Equipment [Line Items]                
Estimated useful (in years)   10 years            
Building | Maximum                
Property, Plant and Equipment [Line Items]                
Estimated useful (in years)   39 years            
Furniture, fixtures, and equipment | Minimum                
Property, Plant and Equipment [Line Items]                
Estimated useful (in years)   2 years            
Furniture, fixtures, and equipment | Maximum                
Property, Plant and Equipment [Line Items]                
Estimated useful (in years)   20 years            
Adoption of Accounting Guidance ASU 2016-01 | Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Equity               0
Adoption of Accounting Guidance ASU 2014-09                
Property, Plant and Equipment [Line Items]                
Retained earnings             $ 1,800  
Adoption of Accounting Guidance ASU 2014-09 | Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Equity               1,780
Adoption of Accounting Guidance ASU 2016-13 | Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Decrease in the allowance for credit losses on loans $ 2,500              
Increase in the allowance for credit losses on off-balance sheet credit exposures 400              
Decrease in deferred tax assets, valuation allowance 400              
Accumulated Other Comprehensive (Loss) Income                
Property, Plant and Equipment [Line Items]                
Equity   $ (32,074) (32,074) (32,074) (43,564) (63,165)   (51,296)
Accumulated Other Comprehensive (Loss) Income | Adoption of Accounting Guidance ASU 2016-01 | Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Equity             $ 65 65
Retained Earnings                
Property, Plant and Equipment [Line Items]                
Equity   $ 418,413 $ 418,413 $ 418,413 370,477 $ 319,396   265,007
Retained Earnings | Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Equity         $ 1,707      
Retained Earnings | Adoption of Accounting Guidance ASU 2016-01 | Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Equity               (65)
Retained Earnings | Adoption of Accounting Guidance ASU 2014-09 | Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Equity               $ 1,780
Retained Earnings | Adoption of Accounting Guidance ASU 2016-13 | Cumulative Effect, Adjustment                
Property, Plant and Equipment [Line Items]                
Equity $ 1,700